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<div class="header">
  <div class="summary">
<a href="#func-members">Functions</a>  </div>
  <div class="headertitle">
<div class="title">MFCC<div class="ingroups"><a class="el" href="group__groupTransforms.html">Transform Functions</a></div></div>  </div>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga0b817baf579405c6765d5e3e2360cc2e"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCC.html#ga0b817baf579405c6765d5e3e2360cc2e">arm_mfcc_f16</a> (const <a class="el" href="structarm__mfcc__instance__f16.html">arm_mfcc_instance_f16</a> *<a class="el" href="arm__bayes__example__f32_8c.html#ad5af783c9e1eb1514dec0a59dac35eb7">S</a>, float16_t *pSrc, float16_t *pDst, float16_t *pTmp)</td></tr>
<tr class="memdesc:ga0b817baf579405c6765d5e3e2360cc2e"><td class="mdescLeft">&#160;</td><td class="mdescRight">MFCC F16.  <a href="#ga0b817baf579405c6765d5e3e2360cc2e">More...</a><br/></td></tr>
<tr class="separator:ga0b817baf579405c6765d5e3e2360cc2e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gada3ab681711c96cc8b39394a42614678"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCC.html#gada3ab681711c96cc8b39394a42614678">arm_mfcc_f32</a> (const <a class="el" href="structarm__mfcc__instance__f32.html">arm_mfcc_instance_f32</a> *<a class="el" href="arm__bayes__example__f32_8c.html#ad5af783c9e1eb1514dec0a59dac35eb7">S</a>, <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrc, <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pDst, <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pTmp)</td></tr>
<tr class="memdesc:gada3ab681711c96cc8b39394a42614678"><td class="mdescLeft">&#160;</td><td class="mdescRight">MFCC F32.  <a href="#gada3ab681711c96cc8b39394a42614678">More...</a><br/></td></tr>
<tr class="separator:gada3ab681711c96cc8b39394a42614678"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gae6a307eafd0bb6534369d239e76ef766"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCC.html#gae6a307eafd0bb6534369d239e76ef766">arm_mfcc_init_f16</a> (<a class="el" href="structarm__mfcc__instance__f16.html">arm_mfcc_instance_f16</a> *<a class="el" href="arm__bayes__example__f32_8c.html#ad5af783c9e1eb1514dec0a59dac35eb7">S</a>, uint32_t fftLen, uint32_t nbMelFilters, uint32_t nbDctOutputs, const float16_t *dctCoefs, const uint32_t *filterPos, const uint32_t *filterLengths, const float16_t *filterCoefs, const float16_t *windowCoefs)</td></tr>
<tr class="memdesc:gae6a307eafd0bb6534369d239e76ef766"><td class="mdescLeft">&#160;</td><td class="mdescRight">Initialization of the MFCC F16 instance structure.  <a href="#gae6a307eafd0bb6534369d239e76ef766">More...</a><br/></td></tr>
<tr class="separator:gae6a307eafd0bb6534369d239e76ef766"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga0e411f0503b1187c69adee7bc949fd1f"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCC.html#ga0e411f0503b1187c69adee7bc949fd1f">arm_mfcc_init_f32</a> (<a class="el" href="structarm__mfcc__instance__f32.html">arm_mfcc_instance_f32</a> *<a class="el" href="arm__bayes__example__f32_8c.html#ad5af783c9e1eb1514dec0a59dac35eb7">S</a>, uint32_t fftLen, uint32_t nbMelFilters, uint32_t nbDctOutputs, const <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *dctCoefs, const uint32_t *filterPos, const uint32_t *filterLengths, const <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *filterCoefs, const <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *windowCoefs)</td></tr>
<tr class="memdesc:ga0e411f0503b1187c69adee7bc949fd1f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Initialization of the MFCC F32 instance structure.  <a href="#ga0e411f0503b1187c69adee7bc949fd1f">More...</a><br/></td></tr>
<tr class="separator:ga0e411f0503b1187c69adee7bc949fd1f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga7e55fc08a473af73055021aedae27c32"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCC.html#ga7e55fc08a473af73055021aedae27c32">arm_mfcc_init_q15</a> (<a class="el" href="structarm__mfcc__instance__q15.html">arm_mfcc_instance_q15</a> *<a class="el" href="arm__bayes__example__f32_8c.html#ad5af783c9e1eb1514dec0a59dac35eb7">S</a>, uint32_t fftLen, uint32_t nbMelFilters, uint32_t nbDctOutputs, const <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *dctCoefs, const uint32_t *filterPos, const uint32_t *filterLengths, const <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *filterCoefs, const <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *windowCoefs)</td></tr>
<tr class="memdesc:ga7e55fc08a473af73055021aedae27c32"><td class="mdescLeft">&#160;</td><td class="mdescRight">Initialization of the MFCC F32 instance structure.  <a href="#ga7e55fc08a473af73055021aedae27c32">More...</a><br/></td></tr>
<tr class="separator:ga7e55fc08a473af73055021aedae27c32"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga758406a367635b2878ea1f59107087db"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCC.html#ga758406a367635b2878ea1f59107087db">arm_mfcc_init_q31</a> (<a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> *<a class="el" href="arm__bayes__example__f32_8c.html#ad5af783c9e1eb1514dec0a59dac35eb7">S</a>, uint32_t fftLen, uint32_t nbMelFilters, uint32_t nbDctOutputs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *dctCoefs, const uint32_t *filterPos, const uint32_t *filterLengths, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *filterCoefs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *windowCoefs)</td></tr>
<tr class="memdesc:ga758406a367635b2878ea1f59107087db"><td class="mdescLeft">&#160;</td><td class="mdescRight">Initialization of the MFCC F32 instance structure.  <a href="#ga758406a367635b2878ea1f59107087db">More...</a><br/></td></tr>
<tr class="separator:ga758406a367635b2878ea1f59107087db"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga1ec288fa9eb7e85c8196c32dfe8f3f9b"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCC.html#ga1ec288fa9eb7e85c8196c32dfe8f3f9b">arm_mfcc_q15</a> (const <a class="el" href="structarm__mfcc__instance__q15.html">arm_mfcc_instance_q15</a> *<a class="el" href="arm__bayes__example__f32_8c.html#ad5af783c9e1eb1514dec0a59dac35eb7">S</a>, <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pSrc, <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pDst, <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pTmp)</td></tr>
<tr class="memdesc:ga1ec288fa9eb7e85c8196c32dfe8f3f9b"><td class="mdescLeft">&#160;</td><td class="mdescRight">MFCC Q15.  <a href="#ga1ec288fa9eb7e85c8196c32dfe8f3f9b">More...</a><br/></td></tr>
<tr class="separator:ga1ec288fa9eb7e85c8196c32dfe8f3f9b"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga7ab98731e9e4a7705be0b3ca0c5bd94c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCC.html#ga7ab98731e9e4a7705be0b3ca0c5bd94c">arm_mfcc_q31</a> (const <a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> *<a class="el" href="arm__bayes__example__f32_8c.html#ad5af783c9e1eb1514dec0a59dac35eb7">S</a>, <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pSrc, <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pDst, <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pTmp)</td></tr>
<tr class="memdesc:ga7ab98731e9e4a7705be0b3ca0c5bd94c"><td class="mdescLeft">&#160;</td><td class="mdescRight">MFCC Q31.  <a href="#ga7ab98731e9e4a7705be0b3ca0c5bd94c">More...</a><br/></td></tr>
<tr class="separator:ga7ab98731e9e4a7705be0b3ca0c5bd94c"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
<p>MFCC Transform</p>
<p>There are separate functions for floating-point, Q15, and Q31 data types.</p>
<p>MFCC Transform</p>
<p>There are separate functions for floating-point, Q15, and Q15 data types.</p>
<p>MFCC Transform</p>
<p>There are separate functions for floating-point, Q31, and Q31 data types. </p>
<h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="ga0b817baf579405c6765d5e3e2360cc2e"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void arm_mfcc_f16 </td>
          <td>(</td>
          <td class="paramtype">const <a class="el" href="structarm__mfcc__instance__f16.html">arm_mfcc_instance_f16</a> *&#160;</td>
          <td class="paramname"><em>S</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float16_t *&#160;</td>
          <td class="paramname"><em>pSrc</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float16_t *&#160;</td>
          <td class="paramname"><em>pDst</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float16_t *&#160;</td>
          <td class="paramname"><em>pTmp</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">pSrc</td><td>points to the input samples </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output MFCC values </td></tr>
    <tr><td class="paramdir">[in,out]</td><td class="paramname">pTmp</td><td>points to a temporary buffer of complex</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>none</dd></dl>
<dl class="section user"><dt>Description</dt><dd>The number of input samples if the FFT length used when initializing the instance data structure.</dd></dl>
<p>The temporary buffer has a 2*fft length size when MFCC is implemented with CFFT. It has length FFT Length + 2 when implemented with RFFT (default implementation).</p>
<p>The source buffer is modified by this function. </p>

</div>
</div>
<a class="anchor" id="gada3ab681711c96cc8b39394a42614678"></a>
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          <td class="memname">void arm_mfcc_f32 </td>
          <td>(</td>
          <td class="paramtype">const <a class="el" href="structarm__mfcc__instance__f32.html">arm_mfcc_instance_f32</a> *&#160;</td>
          <td class="paramname"><em>S</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *&#160;</td>
          <td class="paramname"><em>pSrc</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *&#160;</td>
          <td class="paramname"><em>pDst</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *&#160;</td>
          <td class="paramname"><em>pTmp</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">pSrc</td><td>points to the input samples </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output MFCC values </td></tr>
    <tr><td class="paramdir">[in,out]</td><td class="paramname">pTmp</td><td>points to a temporary buffer of complex</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>none</dd></dl>
<dl class="section user"><dt>Description</dt><dd>The number of input samples if the FFT length used when initializing the instance data structure.</dd></dl>
<p>The temporary buffer has a 2*fft length size when MFCC is implemented with CFFT. It has length FFT Length + 2 when implemented with RFFT (default implementation).</p>
<p>The source buffer is modified by this function. </p>

</div>
</div>
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          <td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_init_f16 </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="structarm__mfcc__instance__f16.html">arm_mfcc_instance_f16</a> *&#160;</td>
          <td class="paramname"><em>S</em>, </td>
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        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>fftLen</em>, </td>
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        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>nbMelFilters</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>nbDctOutputs</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const float16_t *&#160;</td>
          <td class="paramname"><em>dctCoefs</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const uint32_t *&#160;</td>
          <td class="paramname"><em>filterPos</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const uint32_t *&#160;</td>
          <td class="paramname"><em>filterLengths</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const float16_t *&#160;</td>
          <td class="paramname"><em>filterCoefs</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const float16_t *&#160;</td>
          <td class="paramname"><em>windowCoefs</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
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</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[out]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">fftLen</td><td>fft length </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">nbMelFilters</td><td>number of Mel filters </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">nbDctOutputs</td><td>number of Dct outputs </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">dctCoefs</td><td>points to an array of DCT coefficients </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">filterPos</td><td>points of the array of filter positions </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">filterLengths</td><td>points to the array of filter lengths </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">filterCoefs</td><td>points to the array of filter coefficients </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">windowCoefs</td><td>points to the array of window coefficients</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>error status</dd></dl>
<dl class="section user"><dt>Description</dt><dd>The matrix of Mel filter coefficients is sparse. Most of the coefficients are zero. To avoid multiplying the spectrogram by those zeros, the filter is applied only to a given position in the spectrogram and on a given number of FFT bins (the filter length). It is the reason for the arrays filterPos and filterLengths.</dd></dl>
<p>window coefficients can describe (for instance) a Hamming window. The array has the same size as the FFT length.</p>
<p>The folder Scripts is containing a Python script which can be used to generate the filter, dct and window arrays. </p>

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          <td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_init_f32 </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="structarm__mfcc__instance__f32.html">arm_mfcc_instance_f32</a> *&#160;</td>
          <td class="paramname"><em>S</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>fftLen</em>, </td>
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        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>nbMelFilters</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>nbDctOutputs</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *&#160;</td>
          <td class="paramname"><em>dctCoefs</em>, </td>
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        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const uint32_t *&#160;</td>
          <td class="paramname"><em>filterPos</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const uint32_t *&#160;</td>
          <td class="paramname"><em>filterLengths</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *&#160;</td>
          <td class="paramname"><em>filterCoefs</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *&#160;</td>
          <td class="paramname"><em>windowCoefs</em>&#160;</td>
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        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
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</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[out]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">fftLen</td><td>fft length </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">nbMelFilters</td><td>number of Mel filters </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">nbDctOutputs</td><td>number of Dct outputs </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">dctCoefs</td><td>points to an array of DCT coefficients </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">filterPos</td><td>points of the array of filter positions </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">filterLengths</td><td>points to the array of filter lengths </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">filterCoefs</td><td>points to the array of filter coefficients </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">windowCoefs</td><td>points to the array of window coefficients</td></tr>
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  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>error status</dd></dl>
<dl class="section user"><dt>Description</dt><dd>The matrix of Mel filter coefficients is sparse. Most of the coefficients are zero. To avoid multiplying the spectrogram by those zeros, the filter is applied only to a given position in the spectrogram and on a given number of FFT bins (the filter length). It is the reason for the arrays filterPos and filterLengths.</dd></dl>
<p>window coefficients can describe (for instance) a Hamming window. The array has the same size as the FFT length.</p>
<p>The folder Scripts is containing a Python script which can be used to generate the filter, dct and window arrays. </p>

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          <td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_init_q15 </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="structarm__mfcc__instance__q15.html">arm_mfcc_instance_q15</a> *&#160;</td>
          <td class="paramname"><em>S</em>, </td>
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        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>fftLen</em>, </td>
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        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>nbMelFilters</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>nbDctOutputs</em>, </td>
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        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *&#160;</td>
          <td class="paramname"><em>dctCoefs</em>, </td>
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        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const uint32_t *&#160;</td>
          <td class="paramname"><em>filterPos</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const uint32_t *&#160;</td>
          <td class="paramname"><em>filterLengths</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *&#160;</td>
          <td class="paramname"><em>filterCoefs</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *&#160;</td>
          <td class="paramname"><em>windowCoefs</em>&#160;</td>
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        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
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</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[out]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">fftLen</td><td>fft length </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">nbMelFilters</td><td>number of Mel filters </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">nbDctOutputs</td><td>number of Dct outputs </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">dctCoefs</td><td>points to an array of DCT coefficients </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">filterPos</td><td>points of the array of filter positions </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">filterLengths</td><td>points to the array of filter lengths </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">filterCoefs</td><td>points to the array of filter coefficients </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">windowCoefs</td><td>points to the array of window coefficients</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>error status</dd></dl>
<dl class="section user"><dt>Description</dt><dd>The matrix of Mel filter coefficients is sparse. Most of the coefficients are zero. To avoid multiplying the spectrogram by those zeros, the filter is applied only to a given position in the spectrogram and on a given number of FFT bins (the filter length). It is the reason for the arrays filterPos and filterLengths.</dd></dl>
<p>window coefficients can describe (for instance) a Hamming window. The array has the same size as the FFT length.</p>
<p>The folder Scripts is containing a Python script which can be used to generate the filter, dct and window arrays. </p>

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          <td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_init_q31 </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> *&#160;</td>
          <td class="paramname"><em>S</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>fftLen</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>nbMelFilters</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>nbDctOutputs</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *&#160;</td>
          <td class="paramname"><em>dctCoefs</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const uint32_t *&#160;</td>
          <td class="paramname"><em>filterPos</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const uint32_t *&#160;</td>
          <td class="paramname"><em>filterLengths</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *&#160;</td>
          <td class="paramname"><em>filterCoefs</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *&#160;</td>
          <td class="paramname"><em>windowCoefs</em>&#160;</td>
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        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[out]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">fftLen</td><td>fft length </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">nbMelFilters</td><td>number of Mel filters </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">nbDctOutputs</td><td>number of Dct outputs </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">dctCoefs</td><td>points to an array of DCT coefficients </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">filterPos</td><td>points of the array of filter positions </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">filterLengths</td><td>points to the array of filter lengths </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">filterCoefs</td><td>points to the array of filter coefficients </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">windowCoefs</td><td>points to the array of window coefficients</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>error status</dd></dl>
<dl class="section user"><dt>Description</dt><dd>The matrix of Mel filter coefficients is sparse. Most of the coefficients are zero. To avoid multiplying the spectrogram by those zeros, the filter is applied only to a given position in the spectrogram and on a given number of FFT bins (the filter length). It is the reason for the arrays filterPos and filterLengths.</dd></dl>
<p>window coefficients can describe (for instance) a Hamming window. The array has the same size as the FFT length.</p>
<p>The folder Scripts is containing a Python script which can be used to generate the filter, dct and window arrays. </p>

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          <td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_q15 </td>
          <td>(</td>
          <td class="paramtype">const <a class="el" href="structarm__mfcc__instance__q15.html">arm_mfcc_instance_q15</a> *&#160;</td>
          <td class="paramname"><em>S</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *&#160;</td>
          <td class="paramname"><em>pSrc</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *&#160;</td>
          <td class="paramname"><em>pDst</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *&#160;</td>
          <td class="paramname"><em>pTmp</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">pSrc</td><td>points to the input samples in Q15 </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output MFCC values in q8.7 format </td></tr>
    <tr><td class="paramdir">[in,out]</td><td class="paramname">pTmp</td><td>points to a temporary buffer of complex</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>none</dd></dl>
<dl class="section user"><dt>Description</dt><dd>The number of input samples is the FFT length used when initializing the instance data structure.</dd></dl>
<p>The temporary buffer has a 2*fft length.</p>
<p>The source buffer is modified by this function.</p>
<p>The function may saturate. If the FFT length is too big and the number of MEL filters too small then the fixed point computations may saturate. </p>

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          <td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_q31 </td>
          <td>(</td>
          <td class="paramtype">const <a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> *&#160;</td>
          <td class="paramname"><em>S</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *&#160;</td>
          <td class="paramname"><em>pSrc</em>, </td>
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        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *&#160;</td>
          <td class="paramname"><em>pDst</em>, </td>
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        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *&#160;</td>
          <td class="paramname"><em>pTmp</em>&#160;</td>
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        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
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</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">pSrc</td><td>points to the input samples in Q31 </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output MFCC values in q8.23 format </td></tr>
    <tr><td class="paramdir">[in,out]</td><td class="paramname">pTmp</td><td>points to a temporary buffer of complex</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>none</dd></dl>
<dl class="section user"><dt>Description</dt><dd>The number of input samples is the FFT length used when initializing the instance data structure.</dd></dl>
<p>The temporary buffer has a 2*fft length.</p>
<p>The source buffer is modified by this function.</p>
<p>The function may saturate. If the FFT length is too big and the number of MEL filters too small then the fixed point computations may saturate. </p>

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